JP4780170B2 - Vehicle motor drive device - Google Patents

Description

  The present invention relates to a vehicle motor drive device, and more particularly, a motor that is attached under a body spring and generates power for rotating a wheel by feeding power, and is attached to the body spring and converts DC power into AC power. The present invention relates to a vehicle motor drive device using a shield wire as a power supply cable for electrically connecting an inverter that supplies power to a motor.

Conventionally, a motor that generates power for rotating wheels by power supply, an inverter that converts DC power to AC power and supplies the motor, a shield wire as a power supply cable that electrically connects the motor and the inverter, There is known a vehicular motor drive device (see, for example, Patent Document 1). In this apparatus, the shield layer of the shield wire is grounded to an inverter case that houses the inverter via a high-frequency reactor. The inverter case is connected to the vehicle body. The high-frequency reactor absorbs high-frequency potential fluctuations that occur in the shield wire. For this reason, it is suppressed that the high frequency noise which arises in a shield wire propagates to the vehicle body side.
JP 2006-80215 A

  However, a high frequency reactor is generally expensive and has a shape in which a conductor is wound around a core, so that a mounting space is increased, and furthermore, there is radiation noise radiated from the reactor itself. A shield covering itself is required. In this respect, in the above-described device, high-frequency noise generated in the shield wire is prevented from propagating to the vehicle body side, resulting in an increase in cost and enlargement / complication of the structure.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a vehicle motor drive device capable of suppressing high-frequency noise from being propagated to the vehicle body side with a simple and inexpensive configuration. And

The above object is provided under a vehicle body spring, and generates a power for rotating a wheel by power feeding, a motor mounted on the vehicle body spring, converts direct current power into alternating current power, and feeds the motor, A motor drive device for a vehicle, comprising: a shield wire as a power supply cable for electrically connecting a motor and the inverter, wherein a shield layer of the shield wire is insulated from an inverter case housing the inverter , is grounded to the motor case for housing the motor Rutotomoni, process through the ground into the motor case of the shield layer, in the vehicle body sprung or road surface through the high-frequency noise the motor casing to be generated in the shielded wire The motor case is connected to the suspension arm so that the length of the path passing through the motor case is shortened. Connections or hub bearing is achieved by the vehicle motor driving system that is implemented in the vicinity of the mounting position provided that.

In this aspect of the invention, the shield layer of the shield wire as a power supply cable that electrically connects the motor and the inverter is insulated from the inverter case, and high frequency noise generated in the shield wire of the motor case as the length of the path traveling through the motor case is shortened in the process of flowing through the vehicle body sprung or road surface through, or connection between the suspension arm are grounded near the mounting position of the hub bearing. In such a structure, since the high frequency noise generated in the shield wire is attenuated by the electrical resistance of the suspension bush and the wheel tire, the high frequency noise is suppressed from propagating to the vehicle body side. In this case, suppression of the propagation of high-frequency noise to the vehicle body can be realized only by limiting the contact point of the shield layer to the motor case. Therefore, according to the present invention, it is possible to suppress high-frequency noise from being propagated to the vehicle body side with a simple and inexpensive configuration.

In the above-described vehicle motor drive device, the motor is a three-phase AC motor, and the shield wire is provided independently for each of the three phases, and two of the three shield wires. The shield layers of the two shield wires are connected to each other at the motor side ends, and one of the two shield wires and the shield layer of the remaining one of the three shield wires DOO connected together at the inverter side ends of and, as said also the connection portion of the motor case is ground in the vicinity of the mounting position of the shielding layer of one shield line該残Ri the motor side end Good.

  In the invention of this aspect, the three shield wires are parallel to each other between the motor and the inverter, and the shield layers are connected in series. In such a structure, when noise is superimposed on each of the three shield wires from a noise source existing outside the shield wire, a noise current flows in the same direction between the motor and the inverter in each shield wire. The noise currents flowing through the shielded wires cancel each other, so that the noise received from the outside of the power supply cable is reduced to 1/3. For this reason, compared with the configuration in which the three shield wires are simply arranged adjacent to each other between the motor and the inverter, it is possible to suppress the externally generated noise from propagating to the vehicle body side. In this case, suppression of noise propagation to the vehicle body can be realized only by limiting the connection of the three shield wires at the end of the shield layer. Therefore, according to the present invention, it is possible to suppress noise from being propagated to the vehicle body side with a simple and inexpensive configuration.

  The above object is provided under a vehicle body spring, and generates a power for rotating a wheel by power feeding, a motor mounted on the vehicle body spring, converts direct current power into alternating current power, and feeds the motor, A motor drive device for a vehicle comprising a shield wire as a power supply cable for electrically connecting a motor and the inverter, wherein a bush is attached to both ends of the shield layer of the shield wire via a relay conductor. This is achieved by a vehicle motor drive device that is grounded to the suspension arm, stabilizer, or suspension member.

  In the invention of this aspect, the shield layer of the shield wire as the power supply cable that electrically connects the motor and the inverter is grounded to the suspension arm, the stabilizer, or the suspension member having bushes attached to both ends via the relay conductor. ing. In such a structure, high-frequency noise generated in the shield wire propagates to the suspension arm, stabilizer, or suspension member via the relay conductor, but is attenuated by the electrical resistance of the bush, so that the high-frequency noise is reduced to the motor case or the vehicle body. Propagation to the main body side is suppressed. In this case, the suppression of high-frequency noise propagation is realized only by limiting the ground point of the shield layer. Therefore, according to the present invention, it is possible to suppress high-frequency noise from being propagated to the motor case or the vehicle body side with a simple and inexpensive configuration.

The above object is provided under a vehicle body spring, and generates a power for rotating a wheel by power feeding, a motor mounted on the vehicle body spring, converts direct current power into alternating current power, and feeds the motor, A motor drive device for a vehicle, comprising: a shield wire as a power supply cable that electrically connects the motor and the inverter; and an insulating member that insulates a shield layer of the shield wire from an inverter case that houses the inverter; An electrically conductive rubber member that functions as part of a fixture that fixes the motor side end of the shielded wire to a motor case that houses the motor, the volume resistivity being less than the volume resistivity of the insulating member ; , wherein the shield wire of the shield layer, a vehicle motor drive device is grounded to the motor case via the rubber member More is achieved.

In the invention of this aspect, the shield wire as a power supply cable that electrically connects the motor and the inverter is insulated from the inverter case by an insulating member. Further, the motor side end of the shielded wire is fixed to the motor case using a conductive rubber member whose volume resistivity is less than the volume resistivity of the insulating member, and the shield layer of the shield wire is The motor case is grounded via the rubber member. In such a structure, since the shield wire is flexibly connected between the motor and the inverter, the durability of the shield wire is ensured even when the upper body spring and the lower body spring are relatively displaced, and the shield wire Since the high-frequency noise generated in the motor is propagated to the motor case while being attenuated by the electrical resistance of the conductive rubber member, the high-frequency noise is suppressed from propagating to the vehicle body side. In this case, the suppression of the propagation of high-frequency noise to the vehicle body can be realized only by grounding the shield layer to the motor case via a conductive rubber member. Therefore, according to the present invention, it is possible to suppress high-frequency noise from being propagated to the vehicle body side with a simple and inexpensive configuration.

Incidentally, in the vehicle motor driving device described above, the suspension bushing provided at the connection portion between the vehicle body unsprung and sprung body may be a Rukoto which have a rubber member having conductivity.

  In the invention of this aspect, the shield layer of the shield wire is connected to the vehicle body spring via the rubber member of the suspension bush. In such a structure, high-frequency noise generated in the shield wire is attenuated by the rubber member when propagating onto the vehicle body spring via the suspension bush. In this case, suppression of high-frequency noise propagation to the vehicle body is realized by providing a conductive rubber member on the suspension bush. Therefore, according to the present invention, it is possible to suppress high-frequency noise from being propagated to the vehicle body side with a simple and inexpensive configuration.

Also, the above object is to provide a motor that is attached under the body spring and generates power to rotate the wheel by power feeding, and an inverter that is attached to the body spring and converts DC power into AC power to feed the motor. Electrically connecting a shield wire for power feeding as a power feeding cable for electrically connecting the motor and the inverter, sensors disposed in a motor case for housing the motor, and a controller mounted on a body spring. the vehicle motor drive device and a shield line signal as a signal line connected to the shield layer of the power supply shielded wire, it is grounded to the motor case for accommodating the motor, the shield layer The motor case is grounded, and high-frequency noise generated in the shield wire flows on the body spring or on the road surface via the motor case. As the length of the path traveling through the motor casing becomes shorter in extent, the motor case is realized in the vicinity of the mounting position of the connection portion or hub bearing is connected to the suspension arm is provided Rutotomoni, shielded wire the signal This is achieved by a vehicle motor drive device in which the shield layer is grounded on the body spring.

In the invention of this aspect, the shield layer of the power supply shield wire as a power supply cable that electrically connects the motor and the inverter is such that high-frequency noise generated in the shield wire of the motor case is generated on the body spring via the motor case or so that the length of the path traveling through the motor case is shortened in the process of flowing to the road surface, or the connection portion of the suspension arm are grounded near the mounting position of the hub bearing. In addition, the shield layer of the signal shield wire as a signal wire that electrically connects the sensors in the motor case and the controller on the vehicle body spring is grounded on the vehicle body spring, but is not grounded on the motor case side. Absent. In such a structure, the high-frequency noise generated in the power supply shield wire is attenuated by the electrical resistance of the suspension bush and the wheel tire and is difficult to propagate to the signal shield wire through the motor case. Propagation to the main body and the signal shield wire is suppressed. In this case, the suppression of high-frequency noise propagation is realized only by limiting the ground point of the shield layer of the power supply shield line or the signal shield line. Therefore, according to the present invention, it is possible to suppress the high-frequency noise generated in the power supply shield wire from being propagated to the vehicle body side or the signal shield wire with a simple and inexpensive configuration.

  In the above-described vehicle motor drive device, the inverter-side end portion of the feeding shield wire is insulated from the body spring, and the motor case-side end portion of the signal shield wire is insulated from the bottom of the body spring. It is good to do.

  The vehicle motor drive device described above may further include an insulating member that covers the sensors so as to be electrically independent of the motor case.

  In the invention of this aspect, the sensors are electrically independent from the motor case due to the presence of the insulating member. For this reason, the propagation of the high frequency noise generated in the power supply shield wire to the signal shield wire through the motor case is reliably prevented.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that a high frequency noise is propagated to the vehicle body side with a simple and cheap structure.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a main part of a vehicle equipped with a vehicle motor drive device 10 according to a first embodiment of the present invention. FIG. 2 shows a configuration diagram of the vehicle motor drive device 10 of the present embodiment. FIG. 3 is a cross-sectional view of a terminal block case to which a shield wire included in the vehicle motor drive device 10 of the present embodiment is connected. FIG. 4 shows a configuration diagram of a suspension arm included in the vehicle motor drive device 10 of the present embodiment. 4A shows a perspective view of the suspension arm, and FIG. 4B shows a cross-sectional view of the suspension bush.

  The vehicle motor drive device 10 is mounted on, for example, an electric vehicle, and is a device that drives the motor by converting DC power from the in-vehicle power source into AC power by an inverter and supplying power to the in-vehicle motor. As shown in FIG. 1, the vehicle motor drive device 10 includes a motor 12 to be driven. The motor 12 is a driving motor provided for each driving wheel 14 of the vehicle, and is an electric motor for driving that generates power for rotating the driving wheel 14 by power feeding, and in the wheel 16 included in the driving wheel 14. It is an in-foil motor provided in.

  The motor 12 is housed in a motor case 18 which is a conductive metal casing. The motor case 18 is coupled to the suspension arms 24 and 26 via ball joints 20 and 22, and is connected to the wheel 16 of the drive wheel 14 via a hub bearing 28. The suspension arms 24 and 26 are connected to the drive wheel 14 at one end thereof via ball joints 20 and 22 and are fixed to a vehicle body 30 as a vehicle body spring so as to be rotatable at the other end. The suspension arm 26 is further connected to the vehicle body 30 via a spring 32. The motor case 18, that is, the motor 12 and the drive wheel 14 are suspended from the vehicle body 30, and the motor 12 is attached below the vehicle body spring.

  The motor 12 is a three-phase AC motor composed of a U phase, a V phase, and a W phase. An inverter 34, which is a power conversion device, is electrically connected to the motor 12 via a shield wire 36 as a power feeding cable. The inverter 34 converts DC power supplied from a vehicle power source such as an in-vehicle battery into three-phase AC power and supplies it to the motor 12. The inverter 34 is housed in an inverter case 38 that is a conductive metal casing. The inverter case 38 is fixed to the vehicle body 30 on the vehicle body spring by a bolt or the like, and is grounded to the vehicle body 30. The inverter 34 is attached to the vehicle body 30 that is on the vehicle body spring.

  The shield wire 36 is a power supply cable that is provided independently for each phase and distributes the power of each phase from the inverter 34 side to the motor 12 side. The shield wire 36 can bend following the relative displacement between the inverter 34 side and the motor 12 side (that is, between the body spring and the body spring). The shield wire 36 includes a core wire 40, a cylindrical insulating member 42 that covers the core wire 40, and a shield layer 44 that covers the outer peripheral side of the insulating member 42. The shield layer 44 is made of a conductive metal, and is formed, for example, by knitting a fine metal wire on the outer peripheral side of the insulating member 42. The shield layer 44 has a function of blocking electromagnetic waves radiated from the core wire 40 to the outside.

  Each end of the shield wire 36 of each phase on the inverter side is fixed to the inverter case 38 with a cable mounting bracket, and is insulated from the inverter case 38 by an insulating member 48. Each inverter side end of the core wire 40 of the shield wire 36 of each phase is connected to each inverter output terminal in the inverter case 38. Each of these output terminals is connected to a cable connected to the inverter 34 in the inverter case 38.

  Further, the motor side end portions of the shielded wires 36 of each phase are fixed to the conductive metal terminal block case 50 integrally attached and fixed to the motor case 18 by the cable mounting bracket 52, respectively. The terminal block case 50 is insulated by the insulating members 42 and 56. The motor side end of the core wire 40 of the shield wire 36 of each phase is connected to each bus bar 54 provided on the insulator 58 in the terminal block case 50. Each of these bus bars 54 is connected to a cable connected to the motor 12 in the motor case 18 at the motor side terminal 54a. Further, the shield layers 44 of the shield wires 36 of the respective phases are electrically connected to each other at the motor side end portion in the terminal block case 50.

  The shield layer 44 of the shield wire 36 of each phase is insulated from the inverter case 38 at the inverter side end portion and insulated from the terminal block case 50 at the motor side end portion. It is grounded in the vicinity of the connecting portion connected to the arms 24 and 26 and grounded in the vicinity of the mounting position where the hub bearing 28 is provided.

  A suspension bush 60 is provided between the motor case 18 of the drive wheel 14 and the vehicle body 30. The suspension bush 60 is attached to a connection portion between the suspension arms 24 and 26 and the motor case 18 and a connection portion between the suspension arms 24 and 26 and the vehicle body 30 (that is, a connection portion between the vehicle body spring and the vehicle body spring). ing. The suspension bush 60 is, for example, an inner / outer cylinder type bush, and includes an outer cylinder 62 connected to the suspension arms 24 and 26 under the body spring, an inner cylinder 64 connected to the vehicle body 30 on the body spring, and an outer cylinder 62. A rubber member 66 is provided between the inner cylinder 64 and functions as a cushioning material between the body spring and the body spring. The suspension bush 60 is press-fitted into a mounting hole 68 provided in the suspension arms 24 and 26.

At least a part of the rubber member 66 is made of conductive conductive rubber (such as silicon rubber) made of carbon. This conductive rubber has a conductivity of not more than a predetermined volume resistivity (for example, 1 × 10 ⁻⁵ Ωm). Therefore, the rubber member 66 has a function of reliably electrically connecting the suspension arms 24 and 26 to the vehicle body 30 and the motor case 18.

  In the configuration of the vehicle motor drive device 10 described above, the shield layer 44 of the shield wire 36 of each phase is insulated from the inverter case 38 by the insulating member 48 at the inverter side end. Further, the shield layer 44 is connected to each other at the motor side end portion and insulated from the terminal block case 50 by the insulating member 56, but is connected to the suspension arms 24 and 26 of the motor case 18. Are grounded in the vicinity of the connecting portion, and are grounded in the vicinity of the mounting position where the hub bearing 28 is provided.

  According to the configuration in which the shield layer 44 of the shield wire 36 is grounded in the vicinity of the connection portion connected to the suspension arms 24 and 26 of the motor case 18 at the end on the motor side, When high-frequency noise is generated, the high-frequency noise flows from the shield layer 44 to the vicinity of the connection portion of the motor case 18 with the suspension arms 24 and 26, and then from the suspension arms 24 and 26 through the suspension bush 60. It flows to the vehicle body 30. That is, in order for high-frequency noise generated in the shield wire 36 to be transmitted to the vehicle body 30, it is necessary for the high-frequency noise to circulate through the suspension bush 60.

  Since the suspension bush 60 is a member that is provided at the connection portion between the suspension arms 24 and 26 and the vehicle body 30 as described above and allows relative displacement therebetween, as a result, between the connection portions of the suspension bush 60 during traveling of the vehicle. The electrical resistance is relatively high. For this reason, according to the above-described configuration, the high-frequency noise generated in the shield wire 36 is transferred from the shield layer 44 to the vehicle body 30 via the motor case 18 and the suspension arms 24 and 26 until the suspension bush 60 Therefore, the high-frequency noise can be prevented from propagating to the vehicle body 30 and can be made difficult to be transmitted to other electrical components that are grounded to the vehicle body 30. .

  Further, according to the configuration in which the shield layer 44 of the shield wire 36 is grounded near the mounting position where the hub bearing 28 of the motor case 18 is provided at the motor side end portion, the shield wire 36 that is a drive power supply cable has high strength. When high-frequency noise occurs, the high-frequency noise flows from the shield layer 44 to the vicinity of the hub bearing mounting position of the motor case 18 and then flows from the hub bearing 28 to the road surface via the rubber tire portion of the drive wheel 14. For this reason, according to this configuration, the high-frequency noise generated in the shield wire 36 can be released to the road surface while being attenuated by the electric resistance of the rubber tire portion of the drive wheel 14. Propagation to the main body 30 can be suppressed.

  As described above, in this embodiment, the suppression of the propagation of the high-frequency noise generated in the shield wire 36 to the vehicle body 30 is realized by grounding the shield layer 44 of the shield wire 36 as described above. Specifically, in this configuration, the grounding point of the shield layer 44 to the motor case 18 is limited to the vicinity of the connection portion with the suspension arms 24 and 26 and the vicinity of the mounting position of the hub bearing 28. For this reason, in order to suppress the propagation of the high frequency noise to the vehicle body 30, it is sufficient to limit the grounding point of the shield layer 44 to the motor case 18 as described above. Is unnecessary. Therefore, according to the vehicle motor drive device 10 of the present embodiment, it is possible to suppress the high-frequency noise generated in the shield wire 36 from being propagated to the vehicle body 30 side with a simple and inexpensive configuration. Yes.

In this embodiment, the suspension bush 60 has the rubber member 66 as a cushioning material between the vehicle body spring and the vehicle body spring as described above, and a part of this rubber member is as described above. A conductive rubber having conductivity of a predetermined volume resistivity (for example, 1 × 10 ⁻⁵ Ωm) or less is used as a material. For this reason, according to the vehicle motor drive device 10 of the present embodiment, the suspension arms 24 and 26 and the vehicle body 30 are securely connected to the shield wire 36 by the rubber member 66 of the suspension bush 60 while being securely connected to the shield wire 36. It is possible to attenuate the generated high frequency noise.

  Further, according to the configuration in which the shield layer 44 of the shield wire 36 is grounded in the vicinity of the suspension arm connecting portion of the motor case 18 and in the vicinity of the hub bearing mounting position as described above, high-frequency noise generated in the shield wire 36 is generated from the shield layer 44. In the process of flowing to the vehicle body 30 and the road surface, the length of the route transmitted to the motor case 18 itself is shortened. For this reason, according to this structure, the influence which the high frequency noise which generate | occur | produced in the shield wire 36 has on the motor signal wire which connects the sensor itself which exists in the motor case 18, and the sensor, and an external controller can be suppressed. Therefore, according to the vehicle motor drive device 10 of the present embodiment, the suppression of the propagation of the high frequency noise generated in the shield wire 36 to the vehicle body 30 is not significantly affected in the motor case 18 or the motor signal line. It can be realized.

  FIG. 5 shows a configuration diagram of a vehicle motor drive device 100 according to the second embodiment of the present invention. Moreover, FIG. 6 shows sectional drawing of the terminal block case which the shield wire with which the vehicle motor drive device 100 of a present Example is provided connects. 6A is a cross-sectional view of the terminal block case to which the motor side end of the shielded wire is connected, and FIG. 6B is a terminal block case to which the inverter side end of the shielded wire is connected. Cross-sectional views are shown respectively. 5 and 6, the same components as those shown in FIGS. 2 and 3 are given the same reference numerals, and the description thereof is omitted or simplified.

  As shown in FIG. 5, the vehicle motor drive device 100 includes a shield wire 102 as a power supply cable that connects the motor 12 and the inverter 34. The shield wire 102 is a power supply cable that is provided independently for each phase and distributes the power of each phase from the inverter 34 side to the motor 12 side. The shield wire 102 can bend following the relative displacement between the inverter 34 side and the motor 12 side (that is, between the body spring and the body spring).

  The shield wire 102 includes a core wire 40, a cylindrical insulating member 42 that covers the core wire 40, and a shield layer 104 that covers the outer peripheral side of the insulating member 42. The shield layer 104 is made of a conductive metal, and is formed, for example, by weaving a fine metal wire on the outer peripheral side of the insulating member 42. The shield layer 104 has a function of blocking electromagnetic waves radiated from the core wire 40 to the outside.

  The motor side end of each phase shield wire 102 is fixed to a terminal block case 50 integrally attached and fixed to the motor case 18 by a cable mounting bracket 52, while the terminal block case is formed by insulating members 42 and 56. 50 is insulated. The motor side end of the core wire 40 of the shield wire 102 of each phase is connected to each bus bar 54 provided on the insulator 58 in the terminal block case 50.

  Of the three shield wires 102, the shield layers 104 of the two shield wires (for example, U-phase and V-phase shield wires as shown in FIG. 6) 102 are mutually connected at the motor side end in the terminal block case 50. Electrically connected. Hereinafter, this connecting portion is referred to as a connecting portion 106. The shield layer 104 of the remaining one shield wire (for example, W-phase shield wire) 102 is not electrically connected to the shield layer 104 of the other two shield wires 102 at the motor side end. .

  In addition, the inverter-side end of each phase shield wire 102 is fixed to the inverter case 38 by a cable mounting bracket 108, and is insulated from the inverter case 38 by insulating members 42 and 48. Each inverter side end of the core wire 40 of the shield wire 102 of each phase is connected to each inverter output terminal 110 in the inverter case 38. Each of these output terminals 110 is connected to a cable connected to the inverter 34 in the inverter case 38.

  Of the three shield wires 102, one of the shield wires 102 (for example, U-phase and V-phase shield wires as shown in FIG. 6) of which the motor side ends are electrically connected to each other. The shield layer 104 of (for example, the V-phase shield wire) 102 and the shield layer 104 of the remaining one shield wire (for example, the W-phase shield wire) 102 are mutually connected at the inverter side end in the inverter case 38. Electrically connected. Hereinafter, this connecting portion is referred to as a connecting portion 112. The shield layer 104 of the other shield wire 102 (for example, U-phase shield wire) 102 out of the two shield wires 102 described above is the shield layer 104 of the other two shield wires 102 at the end on the inverter side. And are not electrically connected.

  The shield layer 104 of the shield wire 102 of each phase is insulated from the inverter case 38 at the inverter side end portion and insulated from the terminal block case 50 at the motor side end portion. In addition to being grounded in the vicinity of the connecting portion connected to 24, 26, it is grounded in the vicinity of the mounting position where the hub bearing 28 is provided.

  In the configuration of the vehicle motor drive device 100 described above, the shield layer 104 of the shield wire 102 of each phase is insulated from the terminal block case 50 by the insulating member 56 at the end on the motor side. And at one end of the inverter, the insulating member 48 is insulated from the inverter case 38 by one of the remaining two phases and the two phases connected by the connecting portion 106. They are connected to each other by a connecting portion 112. The shield layer 104 of the remaining one-phase shield wire 102 is grounded in the vicinity of the suspension arm connecting portion of the motor case 18 at the motor side end portion and in the vicinity of the hub bearing mounting position. .

  When a noise source existing outside the shield wire 102 of each phase, which is a driving power supply cable, generates noise, the noise is superimposed on each of the three shield wires 102, and a motor is formed on the shield layer 104 of each shield wire 102. A noise current flows in the same direction between the inverter 12 and the inverter 34.

  However, in the configuration in which the shield layers 104 of the three shield wires 102 are connected as described above, the total length of conduction of the shield layers 104 of the three shield wires 102 makes a halfway between the motor 12 and the inverter 34. It becomes like this. In such a configuration, when noise from an external noise source is superimposed on each of the three shield wires 102, two shield wires 102 of the three shield wires 102 (at least the shield layer 104 is at the end on the motor side). , And the shield line 102 connected to the shield layer 104 of the other shield line 102 at the inverter side end portion cancels each other. By matching, the noise received from the external noise source as a whole of the three shield wires 102 is reduced to 1/3.

  For this reason, according to the configuration of the present embodiment, the three shield wires 102 are simply arranged adjacent to each other between the motor 12 and the inverter 34 (specifically, the implementation of the shield layers 104 of the shield layers 104). Compared to the configuration in which there is no staggered connection at the inverter side end or motor side end as in the example), it is possible to suppress the noise generated outside from propagating to the vehicle body 30 via the shield wire 102. It is possible to make it difficult to transmit to other electrical components grounded to the vehicle body 30 via the shield wire 102.

  Thus, in this embodiment, the suppression of the propagation of noise generated from the external noise source to the vehicle body 30 via the shield wire 102 is achieved by connecting / grounding the shield layer 104 of the shield wire 102 of each phase as described above. This is realized. Specifically, in this configuration, the shield layer 104 of any two shield wires 102 is connected to each other at the motor side end portion, and the shield layer 104 of the remaining one shield wire 102 is connected to the inverter side end portion. In addition, the motor is connected to the shield layer 104 of any one of the other shield wires 102 and is grounded near the connection portion of the motor case 18 to the suspension arms 24 and 26 and near the mounting position of the hub bearing 28 at the motor side end. Is. For this reason, in order to suppress propagation of externally generated noise to the vehicle body 30, it is sufficient to limit the connection / grounding of the shield layer 104 of the shield wire 102 of each phase as described above, which is expensive such as a high-frequency reactor. And complicated means are unnecessary. Therefore, according to the vehicle motor drive device 100 of the present embodiment, it is possible to suppress the noise generated from the external noise source from being propagated to the vehicle body 30 side through the shield wire 102 with a simple and inexpensive configuration. Is possible.

  In this embodiment, the noise received from the external noise source is reduced to 1/3 as described above, but the noise flows from the shield layer 104 to the suspension arm 24 of the motor case 18 after flowing into the shield layer 104. , 26 and flows from the suspension arms 24, 26 to the vehicle body 30 via the suspension bush 60, and from the shield layer 104 to the vicinity of the hub bearing mounting position of the motor case 18, and the hub bearing. 28 flows to the road surface through the rubber tire portion of the drive wheel 14.

  For this reason, according to the configuration of the present embodiment, the noise from the external noise source is transferred from the shield layer 104 to the vehicle body 30 via the motor case 18 and the suspension arms 24 and 26 until the noise of the suspension bush 60 is reduced. Can be attenuated by electrical resistance. Further, noise from an external noise source can be released to the road surface while being attenuated by the electric resistance of the rubber tire portion of the drive wheel 14. Accordingly, in this respect as well, it is possible to suppress the propagation of noise from the external noise source to the vehicle body 30.

  FIG. 7 shows a configuration diagram of a vehicle motor drive device 200 according to the third embodiment of the present invention. FIG. 8 shows a cross-sectional view of a relay BOX case to which a shield wire included in the vehicle motor drive device 200 of the present embodiment is connected. FIG. 9 is a perspective view of the entire vehicle motor drive device 200 of this embodiment. FIGS. 9A and 9B are perspective views of examples of the vehicle motor drive device 200, respectively. 7 to 9, the same components as those shown in FIGS. 2 and 3 are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  As shown in FIG. 7, the vehicle motor drive device 200 includes a shield wire 202 as a power supply cable that connects the motor 12 and the inverter 34. The shield wire 202 is a power supply cable that is provided independently for each phase and distributes the power of each phase from the inverter 34 side to the motor 12 side. The shield wire 202 can bend following the relative displacement between the inverter 34 side and the motor 12 side (that is, between the body spring and the body spring below).

  The shield wire 202 includes a core wire 204, a cylindrical insulating member 206 that covers the core wire 204, and a shield layer 208 that covers the outer peripheral side of the insulating member 206. The shield layer 208 is made of a conductive metal, and is formed, for example, by knitting a fine metal wire on the outer peripheral side of the insulating member 206. The shield layer 208 has a function of blocking electromagnetic waves radiated from the core wire 204 to the outside.

The shield wire 202 is relayed by a relay BOX case 210 as a conductive metal conductor in the middle thereof. That is, the shield line 202 includes a shield line 202 _INV connected to the inverter 34 and a shield line 202 _MOT connected to the motor 12. The motor side end of each phase shielded wire 202 _INV is fixed to the relay BOX case 210 by a cable mounting bracket 212, and the inverter side end of each phase shielded wire 202 _MOT is respectively connected to the relay BOX case 210. Are fixed by a cable mounting bracket 214.

The motor side end of the core wire 204 of the shield wire 202 _INV of each phase is insulated from the relay BOX case 210 by the insulating member 206, and the respective bus bars 218 provided on the insulator 216 in the relay BOX case 210. It is connected to the. Further, the inverter side end portions of the core wires 204 of the shield wires 202 _MOT of each phase are connected to the respective bus bars 218 in the relay BOX case 210 while being insulated from the relay BOX case 210 by the insulating member 206. Each bus bar 218 is connected to the core wire 204 of the shielded wire 202 _INV at its inverter side terminal 218a, and is connected to the core wire 204 of the shielded wire 202 _MOT at its motor side terminal 218b.

Further, the motor side end of the shield layer 208 of the shield wire 202 _INV of each phase is connected to the relay BOX case 210 and the cable mounting bracket 212, respectively. The inverter side end portions of the shield layer 208 of the shield wire 202 _MOT of each phase are connected to the relay BOX case 210 and the cable mounting bracket 214, respectively. That is, the shield layers 208 of the shield wires 202 of all phases are connected to the relay BOX case 210.

The inverter side end of each phase shield wire 202 _INV is fixed to the inverter case 38 by a cable mounting bracket, and is insulated from the inverter case 38 by an insulating member 48. Each inverter side end of the core wire 204 of the shield wire 202 _INV of each phase is connected to an inverter output terminal connected to a cable connected to each inverter 34 in the inverter case 38.

The motor side ends of the shield wires 202 _MOT of each phase are fixed to the motor case 18 by cable fittings, and insulated from the motor case 18 by the insulating member 220. The motor side end of the core wire 204 of each phase shield wire 202 _MOT is connected to a motor output terminal to which a cable connected to each motor 12 is connected in the motor case 18.

  The relay BOX case 210 is attached and fixed to the upper suspension arm 24 as shown in FIGS. 9A and 9B. The attachment and fixing position of the relay BOX case 210 is an intermediate position at which the suspension bushings 222a and 222b are attached to both ends of the suspension arm 24. The suspension bush 222 a is a bush at a connection site between the suspension arm 24 and the vehicle body 30. Further, the suspension bush 222 b is a bush at a connection portion between the suspension arm 24 and the motor case 18. It should be noted that at least the suspension bush 222a may have a rubber member 66 partially made of conductive rubber as in the suspension bush 60 described above. In this case, the suspension arm 24 and the vehicle body 30 can be securely connected to each other.

  The relay BOX case 210 may be fixedly attached to the lower suspension arm 26, but in this case, the intermediate BOX case 210 is fixedly attached to an intermediate position where bushes are formed at both ends of the suspension arm 26. .

  In the configuration of the vehicle motor drive device 200 described above, the shield layer 208 of the shield wire 202 of each phase is insulated from the inverter case 38 by the insulating member 48 at the inverter side end and insulated at the motor side end. The member 220 is insulated from the motor case 18. On the other hand, the shield layer 208 is connected to the relay BOX case 210 between the motor 12 and the inverter 34, and the suspension arm 24 has suspension bushes 222 a and 222 b formed at both ends via the relay BOX case 210. Is grounded.

  In such a configuration, when high-frequency noise with high strength is generated in the shield wire 202 that is the driving power supply cable, the high-frequency noise does not flow directly to the inverter case 38 or the motor case 18 and is relayed from the shield layer 208. It flows to the suspension arm 24 via the BOX case 210, and then flows from the suspension arm 24 to the vehicle body 30 and the motor case 18 via the suspension bushings 222a and 222b. That is, in order for the high-frequency noise generated in the shield wire 202 to be transmitted to the vehicle body 30 and the motor case 18, the high-frequency noise needs to circulate through the suspension bushings 222a and 222b.

  The suspension bushings 222a and 222b are members that are provided at the connection portion between the suspension arm 24 and the vehicle body 30 and the connection portion between the suspension arm 24 and the motor case 18, and as a result, allow relative displacement between the two. While the vehicle is running, the electrical resistance between the connecting parts of both is relatively high. For this reason, according to the above-described configuration, the high-frequency noise generated in the shield wire 202 flows from the shield layer 208 to the vehicle body 30 and the motor case 18 via the relay BOX case 210 and the suspension arm 24. Since it can be attenuated by the electrical resistance of the suspension bushings 222a and 222b, the high-frequency noise can be prevented from propagating to the vehicle body 30 and the motor case 18, and other electrical components that are grounded to the vehicle body 30 It is also possible to make it difficult to transmit to a sensor existing in the motor case 18 and a motor signal line connecting the sensor and the external controller.

  As described above, in this embodiment, the high-frequency noise generated in the shield wire 202 is suppressed from propagating to the vehicle body 30 and the motor case 18 by insulating and grounding the shield layer 208 of the shield wire 202 as described above. Realized. Specifically, in this configuration, the shield arm 208 is insulated from the motor case 18 and the inverter case 38, and suspension arms 222a and 222b are provided at both ends via the relay BOX case 210 in the middle of the shield layer 208. 24 is grounded. For this reason, it is sufficient to limit the insulation / grounding of the shield layer 208 as described above in order to suppress the propagation of high-frequency noise to the vehicle body 30 and the motor case 18, and expensive and complicated means such as a high-frequency reactor. Is unnecessary. Therefore, according to the vehicle motor drive device 200 of the present embodiment, it is possible to suppress the high-frequency noise generated in the shield wire 202 from being propagated to the vehicle body 30 or the motor case 18 with a simple and inexpensive configuration. It is possible.

  In the third embodiment, the relay BOX case 210 corresponds to the “relay conductor” described in the claims.

  In the third embodiment, the shield layer 208 of the shield wire 202 is grounded to the suspension arm 24 provided with suspension bushings 222a and 222b at both ends via the relay BOX case 210. It is good also as making it earth | ground to the stabilizer and suspension member in which the bush is provided.

  FIG. 10 shows a configuration diagram of a vehicle motor drive device 300 according to the fourth embodiment of the present invention. Moreover, FIG. 11 shows sectional drawing of the terminal block case which the shield wire with which the vehicle motor drive device 300 of a present Example is provided connects. 10 and 11, the same components as those shown in FIGS. 2 and 3 are given the same reference numerals, and the description thereof is omitted or simplified.

  As shown in FIG. 10, the vehicle motor drive device 300 includes a shield wire 302 as a power supply cable that connects the motor 12 and the inverter 34. The shield wire 302 is a power supply cable that is provided independently for each phase and distributes the power of each phase from the inverter 34 side to the motor 12 side. The shield wire 302 can bend following the relative displacement between the inverter 34 side and the motor 12 side (that is, between the vehicle body spring and the vehicle body spring).

  The shield wire 302 includes a core wire 40, a cylindrical insulating member 42 that covers the core wire 40, and a shield layer 304 that covers the outer peripheral side of the insulating member 42. The shield layer 304 is made of a conductive metal, and is formed, for example, by knitting a fine metal wire on the outer peripheral side of the insulating member 42. The shield layer 304 has a function of blocking electromagnetic waves radiated from the core wire 40 to the outside.

  The inverter side end of each phase shield wire 302 is fixed to the inverter case 38 by a cable mounting bracket, and is insulated from the inverter case 38 by an insulating member 48. Each inverter side end of the core wire 40 of each phase shield wire 302 is connected to each inverter output terminal in the inverter case 38.

  Further, the motor side end portions of the shield wires 302 of the respective phases are fixed to the terminal block case 50 by the cable fittings 52, respectively. The motor side end of the core wire 40 of the shield wire 302 of each phase is connected to the bus bar 54 in the terminal block case 50 while being insulated from the terminal block case 50 by the insulating member 42. The shield layer 304 of each phase shield wire 302 is covered with an insulating member 306 at the outer periphery thereof, and is in contact with the cable mounting bracket 52 and the terminal block case 50 via the rubber member 308 at the end on the motor side. . The rubber member 308 functions as a part of a fixture that fixes the motor side end of the shield wire 302 to the terminal block case 50 (that is, the motor case 18) while having elasticity that allows the shield wire 302 to bend.

The rubber member 308 is made of conductive conductive rubber (such as silicon rubber) made of carbon. This conductive rubber has conductivity of a predetermined volume resistivity (for example, 1 × 10 ⁻⁵ Ωm) or less, and has a volume resistivity less than the volume resistivity of the insulating member 48 on the inverter side. ing. The rubber member 308 has a function of reliably connecting the shield layer 304 of the shield wire 302 and the motor case 18.

  In the configuration of the vehicle motor drive device 300 described above, the shield layer 304 of the shield wire 302 of each phase is insulated from the inverter case 38 by the insulating member 48 at the inverter side end, and at the motor side end. The terminal block case 50 (that is, the motor case 18) is grounded via the member 308.

  The rubber member 308 has elasticity as described above. For this reason, according to such a configuration, the bending of the shield wire 302 can be allowed, so that the relative displacement between the vehicle body spring and the vehicle body spring is allowed, and the electrical connection between the inverter 34 and the motor 12 is allowed. Flexibility can be ensured and the durability of the shield wire 302 can be improved. Further, the rubber member 308 has conductivity with a relatively low volume resistivity as described above. For this reason, according to this configuration, when high-frequency noise with high strength is generated in the shield wire 302 that is the drive power supply cable while the shield layer 304 and the motor case 18 are reliably electrically connected, the motor case 18 It is possible to attenuate high-frequency noise transmitted to.

  The high-frequency noise transmitted from the shield wire 302 to the motor case 18 flows to the vehicle body 30 via the suspension bush 60 and also flows to the road surface via the hub bearing 28, so that it is attenuated to reach the vehicle body 30. A part is escaped to the road surface. Therefore, it is possible to suppress high-frequency noise generated in the shield wire 302 from propagating to the vehicle body 30.

  As described above, in this embodiment, the high-frequency noise generated in the shield wire 302 is suppressed from propagating to the vehicle body 30 through the rubber member 308 on the motor side end of the shield layer 304 of the shield wire 302 as described above. This is realized by connecting to the motor case 18. For this reason, it is sufficient to limit the connection of the shield layer 304 to the motor case 18 as described above in order to suppress the propagation of high-frequency noise to the vehicle body 30, and expensive and complicated means such as a high-frequency reactor are not necessary. It is unnecessary. Therefore, according to the vehicle motor drive device 300 of the present embodiment, the shield can be achieved while ensuring the flexibility of the electrical connection between the inverter 34 and the motor 12 and the durability of the shield wire 302 with a simple and inexpensive configuration. It is possible to suppress high-frequency noise generated on the line 302 from being propagated to the vehicle body 30 side.

  FIG. 12 shows a configuration diagram of the vehicle motor drive device 400 of the present embodiment. In FIG. 12, the same components as those shown in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  As shown in FIG. 12, the vehicle motor drive device 400 includes a shield wire 36 as a power supply cable that connects the motor 12 and the inverter 34, and also includes a shield wire 402 as a signal cable. Hereinafter, the shield wire 36 serving as a power supply cable is referred to as a power supply shield wire 36, and the shield wire 402 serving as a signal cable is referred to as a signal shield wire 402.

  The signal shield wire 402 is a signal cable that connects the resolver 404 provided in the motor case 18 and the inverter 34, and is provided independently for each phase of the resolver 404. Between the inverter 34 and the inverter 34, a signal having a voltage lower than that of the power supply shield line 36 is exchanged. The signal shield wire 402 can bend following the relative displacement between the inverter 34 side and the resolver 404 side (that is, between the vehicle body spring and the vehicle body spring).

  The signal shield line 402 includes a signal line 406, a cylindrical insulating member that covers the signal line 406, and a shield layer 408 that covers the outer peripheral side of the insulating member. The shield layer 408 is made of a conductive metal, and is formed, for example, by braiding a fine metal wire on the outer peripheral side of the insulating member. The shield layer 408 has a function of blocking electromagnetic waves radiated from the signal line 406 to the outside.

  The motor side end of each phase signal shield wire 402 is fixed to the motor case 18 by a cable mounting bracket, and is insulated from the motor case 18 by an insulating member 410. The motor side ends of the signal wires 406 of the signal shield wires 402 for each phase are connected to the resolver 404 in the motor case 18.

  In addition, the inverter side end portions of the signal shield wires 402 of the respective phases are respectively fixed to the inverter case 38 by cable mounting brackets. The inverter side ends of the signal lines 406 of the signal shield wires 402 for each phase are connected to the inverter 34 in the inverter case 38 while being insulated from the inverter case 38 by an insulating member. The shield layers 408 of the signal shield wires 402 for each phase are electrically connected to each other at the inverter side end portion in the inverter case 38, and are further away from the inverter case 38 (further, the connecting portion with the vehicle body 30). Ground).

  In the configuration of the vehicle motor drive device 400 described above, the shield layer 44 of the power feeding shield wire 36 of each phase is insulated from the inverter case 38 by the insulating member 48 at the inverter side end. Further, the shield layer 44 is connected to each other at the motor side end portion and insulated from the terminal block case 50 by the insulating member 56, but is connected to the suspension arms 24 and 26 of the motor case 18. Are grounded in the vicinity of the connecting portion, and are grounded in the vicinity of the mounting position where the hub bearing 28 is provided. According to such a configuration, it is possible to suppress high-frequency noise generated in the power supply shield wire 36 from propagating to the vehicle body 30, and to make it difficult to transmit to other electrical components grounded to the vehicle body 30. It is.

  In the configuration of the vehicle motor drive device 400 described above, the shield layer 408 of the signal shield wire 402 is insulated from the motor case 18 by the insulating member 410 at the motor side end. The shield layer 408 is grounded to the inverter case 38 while being connected to each other at the inverter side end. In other words, the shield case 44 of the power supply shield wire 36 is grounded in the motor case 18 while the shield layer 408 of the signal shield wire 402 is insulated, and the power supply shield wire is provided in the inverter case 38. While 36 shield layers 44 are insulated, the shield layer 408 of the signal shield wire 402 is grounded.

  In such a configuration, when high-frequency noise occurs in the power supply shield line 36 with a high voltage to be handled, even if the high-frequency noise is transmitted to the motor case 18, the signal shield line 402 (signal lines 406 and Both of the shield layer 408) and the high-frequency noise transmitted to the vehicle body 30 via the motor case 18 and the suspension bush 60 are greatly attenuated at that time. It is difficult to be transmitted to the signal shield wire 402. Therefore, according to the present embodiment, the influence of the high-frequency noise generated in the power supply shield line 36 on the signal line 406 and the shield layer 408 of the signal shield line 402 can be suppressed.

  As described above, in the present embodiment, the high-frequency noise generated in the power supply shield wire 36 is suppressed from being propagated to the vehicle body 30 and the propagation to the signal shield wire 402 is controlled by the shield layer 44 of the shield wires 36 and 402. , 408 is realized by performing the insulation and grounding as described above. Therefore, in order to suppress the propagation of high-frequency noise to the vehicle body 30 and the signal shield wire 402, the grounding points of the shield layers 44 and 408 of the shield wires 36 and 402 to the motor case 18 and the inverter case 38 are set as described above. It is sufficient to limit as described above, and expensive and complicated means such as a high-frequency reactor are unnecessary. Therefore, according to the vehicle motor drive device 400 of the present embodiment, high-frequency noise generated in the power supply shield wire 36 is propagated to both the vehicle body 30 and the signal shield wire 402 with a simple and inexpensive configuration. Can be suppressed.

  In the fifth embodiment, since the shield layer 44 of the power supply shield wire 36 is grounded to the motor case 18, a noise component may flow through the motor case 18. May overlap with the vicinity of the connection point of the resolver 404 and the resolver 404 itself.

  Therefore, as shown in FIGS. 13 and 14, an insulating member 500 that covers the resolver 404 and the signal shield wire 402 in the motor case 18 may be provided. According to this configuration, the signal shield wire 402 and the resolver 404 can be electrically independent from other parts of the motor case 18, and the shield layer 408 of the signal shield wire 402 has the same ground potential as that of the vehicle body 30. can do. Accordingly, since the periphery of the resolver 404 in the motor case 18 can be positioned electrically far from the shield layer 44 of the power supply shield wire 36, the periphery of the resolver 404 is in a state where there is less electrical noise than the motor case 18 itself. The high-frequency noise generated in the power supply shield wire 402 hardly affects the periphery of the resolver 404, and the operation stability of the resolver 404 can be ensured. The resolver 404 and the signal shield wire 402 are not limited to being covered with the integral insulating member 500, but the resolver 404 and the signal shield wire 402 may be covered with separate insulating members.

  In this modification, the resolver 404 and the signal line 406 mainly correspond to “sensors” recited in the claims.

  In the fifth embodiment, the resolver 404 is provided as a sensor in the motor case 18 and the signal shield wire 402 that connects the resolver 404 and the inverter 34 is provided. However, a temperature sensor or the like is provided. The present invention may be applied to a configuration in which a signal shield line connecting the temperature sensor and the inverter 34 is provided.

It is principal part sectional drawing of the vehicle carrying the vehicle motor drive device which is 1st Example of this invention. It is a block diagram of the vehicle motor drive device of a present Example. It is sectional drawing of the terminal block case which the shield wire with which the vehicle motor drive device of a present Example is provided connects. It is a block diagram of the suspension arm with which the vehicle motor drive device of a present Example is provided. It is a block diagram of the vehicle motor drive device which is 2nd Example of this invention. It is sectional drawing of the terminal block case which the shield wire with which the vehicle motor drive device of a present Example is provided connects. The block diagram of the motor drive device for vehicles which is 3rd Example of this invention is shown. It is sectional drawing of the relay BOX case which the shield wire with which the vehicle motor drive device of a present Example is provided connects. It is a perspective view of the whole vehicle motor drive device of a present Example. It is a block diagram of the motor drive unit for vehicles which is 4th Example of this invention. It is sectional drawing of the terminal block case which the shield wire with which the vehicle motor drive device of a present Example is provided connects. It is a block diagram of the motor drive unit for vehicles which is 5th Example of this invention. It is a block diagram of the vehicle motor drive device which is a modification of this invention. It is principal part sectional drawing of the motor drive device for vehicles which is a modification of this invention.

Explanation of symbols

10, 100, 200, 300, 400 Vehicle motor drive device 12 Motor 14 Drive wheel 16 Wheel 18 Motor case 24, 26 Suspension arm 28 Hub bearing 30 Body body 34 Inverter 36, 102, 202, 302 Shield wire 40, 204 Core wire 44, 104, 208, 304 Shield layer 60, 222a, 222b Suspension bush 66 Rubber member 210 Relay box case 308 Rubber member 402 Signal shield line 406 Signal line 408 Shield layer of signal shield line 500 Insulating member

Claims (8)

A motor that is mounted under the body spring and generates power for rotating the wheel by power supply; an inverter that is mounted on the body spring and converts DC power into AC power and supplies the motor; and the motor and the inverter A motor drive device for a vehicle comprising: a shield wire as a power supply cable for electrically connecting
The shield layer of the shielded wire, the inverter case for accommodating the inverter is grounded to the motor case to while insulated housing the motor Rutotomoni,
The shield layer is grounded to the motor case so that the high-frequency noise generated in the shield wire flows through the motor case on the body spring or on the road surface so that the length of the path transmitted through the motor case is shortened. A motor drive device for a vehicle, characterized in that the motor case is realized in the vicinity of an attachment position where a connection portion or a hub bearing connected to the suspension arm is provided . The motor is a three-phase AC motor;
The shield wire is provided independently for each of the three phases,
The shield layers of the two shield wires of the three shield wires are connected to each other at the motor side ends, and one of the shield wires of the two shield wires and the shield wire of the three shield wires of the remaining one shielded wire of the shield layer is connected to each other at the inverter side ends, and the motor case is the connecting portion or the shielding layer of one shield line該残Ri the motor side end 2. The vehicle motor drive device according to claim 1, wherein the vehicle motor drive device is grounded in the vicinity of the mounting position. A motor that is mounted under the body spring and generates power for rotating the wheel by power supply; an inverter that is mounted on the body spring and converts DC power into AC power and supplies the motor; and the motor and the inverter A motor drive device for a vehicle comprising: a shield wire as a power supply cable for electrically connecting
A vehicle motor drive device, wherein a shield layer of the shield wire is grounded to a suspension arm, a stabilizer, or a suspension member having bushes attached to both ends via a relay conductor. A motor that is mounted under the body spring and generates power for rotating the wheel by power supply; an inverter that is mounted on the body spring and converts DC power into AC power and supplies the motor; and the motor and the inverter A motor drive device for a vehicle comprising: a shield wire as a power supply cable for electrically connecting
An insulating member that insulates the shield layer of the shield wire from an inverter case that houses the inverter;
A rubber member having a conductivity , which functions as a part of a fixture for fixing the motor side end of the shielded wire to a motor case housing the motor, and whose volume resistivity is less than the volume resistivity of the insulating member ; With
A vehicle motor drive device characterized in that a shield layer of the shield wire is grounded to the motor case via the rubber member. Suspension bushing provided at the connection portion between the vehicle body unsprung and sprung body is a vehicle motor driving system according to any one of claims 1 to 4, characterized in Rukoto that having a rubber member having conductivity . A motor that is mounted under the body spring and generates power for rotating the wheel by power supply; an inverter that is mounted on the body spring and converts DC power into AC power and supplies the motor; and the motor and the inverter As a signal line for electrically connecting a power supply shielded wire as a power supply cable for electrically connecting the sensor, a sensor mounted in a motor case for housing the motor, and a controller mounted on a vehicle body spring A vehicle motor drive device comprising a signal shield wire,
The shield layer of the power supply shielded wire, is grounded to the motor case for housing the motor,
The shield layer is grounded to the motor case so that the high-frequency noise generated in the shield wire flows through the motor case on the body spring or on the road surface so that the length of the path transmitted through the motor case is shortened. , Rutotomoni is realized in the vicinity of the mounting position of the connection portion or hub bearing the motor case is connected to the suspension arm is provided,
A vehicle motor drive device, wherein a shield layer of the signal shield wire is grounded on a vehicle body spring. Insulating the inverter-side end of the shield wire for power feeding from the body spring,
7. The vehicle motor drive device according to claim 6, wherein an end portion of the signal shield wire on the motor case side is insulated from below the vehicle body spring.   The vehicle motor drive device according to claim 6, further comprising an insulating member that covers the sensors so as to be electrically independent of the motor case.